Reset to Factory Settings

I started initiating the communication between ER-5215 and my PC when it asked me to add paper, which I did and then got " Cover Open Err". If I switch the key to other position I get "Sequence Error". The register doesn't respond any more, just make a continuous sound... Is there a way to reinitialize the register so I can re-attempt to connect to my PC and start programming?
Thanks for your help.

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If not work, tris this

NVRAM initialization

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